[CyberAnt]

A treaty does not give up out sovereignty. I don't know where you get that from .. but you need to investigate that assumption.

[B4Ranch]

A treaty is a contract! Get your head out of the dirt. Start thinking again.

[Little Ray]

Article VI. of the Constitution reads:

This Constitution... and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.

In other words treaties ratified by the Senate overrule laws from Constitution on down. One of the scary things is that the Senate, by ratifying a treaty can change the Constitution without bothering to amend it. Imagine a UN treaty on the control of "small arms" being ratified - the Second Amendment become meaningless.